[turbofan] Remove the unused asm.js types from TypeCache.

src/compiler/js-global-object-specialization.h

Index: src/compiler/js-global-object-specialization.h
diff --git a/src/compiler/js-global-object-specialization.h b/src/compiler/js-global-object-specialization.h
index 3ffc67a3773558256f2f120fdfb466f3f82a612f..a6c511e9e5f039a7aa3a3be87fec73a6b9967fd3 100644
--- a/src/compiler/js-global-object-specialization.h
+++ b/src/compiler/js-global-object-specialization.h
@@ -12,8 +12,6 @@ namespace internal {
 
 // Forward declarations.
 class CompilationDependencies;
-class TypeCache;
-
 
 namespace compiler {
 
@@ -22,7 +20,7 @@ class CommonOperatorBuilder;
 class JSGraph;
 class JSOperatorBuilder;
 class SimplifiedOperatorBuilder;
-
+class TypeCache;
 
 // Specializes a given JSGraph to a given global object, potentially constant
 // folding some {JSLoadGlobal} nodes or strength reducing some {JSStoreGlobal}